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These are listed as 0.452 diam but I get 0.453. Could be my inaccuracy.

Few bullets have bases that are really, truly round. Cast lead ones tend to vary the most, so it's best to make several OD measurements across different diameters around the bullet and average the high and low readings.

And many bullets will have different OD's at the front and rear of the body - if you look and measure close enough. A single OD measurement can be very misleading.

Regards

When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

Post #16 used to contain an image showing a method for measuring the body length of a bullet (from which the nose length and minimum COAL could be found) but it disappeared. Here it is again:

It would be useful if Post #16 could be edited to show this image because it's referred to several times throughout this thread.

Regards

When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

If you intend to buy something from Brownells, Sinclair or Police Store, please use their banners above. Whatever you buy from them, gives us a small commission, which helps us keep these sites alive. You still pay the normal price, our commission comes from their profit, so you have nothing to lose, while we have something to gain. Your help is appreciated.